subscriber

Suppose I created a JMS Topic (PropertiesTopic) with one subscriber (PropertiesSubscriber). PropertiesSubscriber is running in a load balanced application server cluster as shown in the picture below. alt text http://www.freeimagehosting.net/uploads/be28c03781.png When a message is delivered to PropertiesTopic, do all the instances of PropertiesSubscriber running on different app servers get that message or does the message get delivered to only one PropertiesSubscriber instance running on an app server determined by the load balancer? JMS 2.0 introduces shared subscriptions . These allow

I have written a ROS subscriber to one of the image topics and I have set my buffer to 1 using: subscriber =rospy.Subscriber("/camera/rgb/image_mono/compressed",CompressedImage, callback, queue_size=1) However my subscriber still lags behind. Any idea what might be causing this? Am I setting the queue size correctly? The queue is for queueing incoming messages. This means, if your callback takes longer to proccess than new messages arrive, only queue size is kept, the others are not processed by your node. I would suggest to print out a message in the publisher node before publishing and a

I started now with Pubsubhubbub (and all about realtime things), but I amhaving trouble with the Subscriber option. I'm trying to develop a webapp in PHP to: Subscribe a RSS (previously Published) to the Hub ( http://pubsubhubbub.appspot.com/ ); Read notifications (updates) from the Hub for the subscription; without succeed!!! :( I verify that exist a library in php to the Subscriber (in Git), but using this lib can't make the Subscribe work's (get a 409 error!). How can I do this? This is an old question and the PHP library ddluis linked to has many flaws. The recommended PHP subscriber in

Is there a method in the API to query the number of subscribers for one of the new profiles? I am talking about the new profiles (not pages), like this one for Tyra Banks: http://www.facebook.com/XOXOTYTY I can see on that page that she has 696k subscribers (more specifically, 696,833 as it shows when you search for her profile), but I cannot find that number in the graph. I know that /userId/subscribers gives a list of my subscribers (which is awesome), but many pages that I'm querying have over 10k subscribers, so it doesn't list them all, and I just need the count. Only user object have

I want to run 2 asynchronous tasks, one followed by the other (sequentially). I have read something about ZIP or Flat, but I didn't understand it very well... My purpose is to load the data from a Local SQLite, and when it finishes, it calls the query to the server (remote). Can someone suggests me, a way to achieve that? This is the RxJava Observable skeleton that I am using (single task): // RxJava Observable Observable.OnSubscribe<Object> onSubscribe = subscriber -> { try { // Do the query or long task... subscriber.onNext(object); subscriber.onCompleted(); } catch (Exception e) {